Abstract: For the problem of layered roof fall of different regions of the same roadway, the paper established mechanics model of lintel structure of fracture instability of roadway layered roof, then it put forward the distinguished method of instability of roadway layered roof strata, discussed affecting factors of quantitative relationship between roadway layered roof fracture instability and strata, and accessed instability forms and limit conditions of rock beam fracture of roadway roof, it established the division index system of roof fall hidden danger level of roadway layered roof, put forward the method of hidden danger classification. It took the height of roadway roof fall as classification index of roof fall hidden danger, and developed stability distinguished software of roadway layered roof, mastered zoning characteristics of roof fall hidden danger level of 2-2 coal in Shigetai mine, gave roof support parameters design of mining roadway based on hidden danger classification of roadway roof fall. It realized differential support design, reduced waste of support material, and decreased the accident probability of roadway of high risk roof fall.